A.CH3NH2〉(CH3)2NH〉(CH3)3N〉NH3B.(CH3)2NH〉CH3NH2〉(CH3)3N〉NH3C.(CH3)3N〉(CH3)2NH〉CH3NH2〉NH3D.NH3〉CH3NH2〉(CH3)2NH〉(CH3)3N
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